On 26 May Reading commenced conversion to a weather ship. An intricate array of meteorological equipment was installed, her number three 3-inch (76 mm) gun mount was replaced by a hangar for a weather blimp, and a supply of cold weather gear was taken on board before the Reading was declared ready for sea on 10 June. Her first weather station was off Boston, where she was forced to "lie to" because it was too deep to anchor. In the fall, the weather ship moved northward and took station between the Canadian and Icelandic coasts. Weather observations were transmitted 12 times daily and homing signals were radioed to aircraft periodically. When relieved from her station, the ship put into either NS Argentia, Newfoundland or Reykjavík, Iceland for refueling and provisioning.
Postwar
On 16 November Reading received orders for decommissioning. She put in at Portsmouth, Virginia, and was decommissioned there on 19 December 1945.
Argentine service
For other ships with the same name, see ARA Heroína.
She was struck from the Navy list on 5 January 1946, delivered to United Boat Service Corporation, New York City, and then resold to Argentina in July 1947 and renamed ARA Heroína (P-32). In Argentine service the armament was re-worked, shipping 3 Swedish Bofors 10.5cm dual purpose guns with 2 twin and 4 single hand-worked 40mm Bofors guns also purchased from Sweden. The ship was scrapped in 1966.